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(NoModeL) A. E. SMITH.

AIR HEATING FURNACE. N0. 376,682. Patented JaJn. 17, 1888.

' 9 UNITED, STATES PATENT Clar ce.

ALFRED E. SMITH, or BRONXQVILLE, NEW YORK.

AIR-l-IEATINGFURNACE.

SPECIFICATION forming part/of Letters Patent No. 376,682, dated January 17, 1888.

Application filed April 23, 1887. Serial K0235187 1. (No model.)

is employed, and the air required for heating apartments or chambers is passed through a drum having flues and surrounding a petroleum or oil stove of any approved description.

The heating-drum and oil-stove are placed within a casing constituting a furnace, and

this casing has means for the admission of cold air and flues for the discharge of the heated air.

The invention briefly outlined in the above description will be fully hereinafter described,

I and then set forth in the claim.

a In the accompanying drawings, Figure 1 is a vertical section of an air-heating furnace constructed according to my invention. Fig. 2 1s a top plan view of the same.

The reference-numeral 1 designates a furnace-chamber or outer shell or casing, which is supported upon legs 2, of suitable length.

At the bottom ofthe furnace is a cold-air chamber, 3, which'is separated from the upper or hot-air chamber, 4, by means of a fioor or horizontal partition, 5. The latter has a series of openings, 6, for admitting cold air into the chamber 4, and at the top of the fur- Dace-chamber are arranged one or more flues,

7, for discharging the heated air into the room in which the furnace is located and into another room remote from the-furnace. Suit able registers are applied to said flues for regulating the passage of hot air. Within the fu rnace, as a medium forheating the cold air admitted into the "same, I locate an air-heating drum, 8, and a petroleum or other oil stove, 9, for furnishing the required heat. The drum 8 may be cylindrical, rectangular, or of any other desired shape, and it has a series of flues, 9, which extend from the base to the top thereof and serve as ducts for the air entering the furnace. The drum8 is providedwith legs 10, which stand upon the perforated floor 5 and serve to raisethe drum above said floor. The petroleunrstove may be of the type recently devised by me, in

which water is vaporized and burned in con- 7 nection with oil; but any other form of oilstove furnishing the necessary degree of heat may be resorted to. The oil-stove stands beneath the air-heating drum 8, or is surrounded by the same, so as to deliver the products of combustion or flame into the space surround-- ing the flues 9. By such arrangement it is obvious that the cold air entering the lower ends of theflues 9 is heated during its upward passage, and it finally escapes into the furnace-chamber, and is from thence taken by the flues 7 to the desired locality for warming purposes. I

A furnace constructed according to my'invention is simple in construction and effective in use, and is portable, so that it can be moved from place to place. It has beenascertained that it will furnish as much heat for warming apartments as a type of furnace requiring the placing of a radiating-stove in a cellar and the building up of masonry around it to form a chamber.

The inner air-heating drum is provided with a pipe, 25, which passes 'through the outer shell and serves to carry off the products of combustion to the chimney. While an oilstove is the most convenient and desirable heating medium, I desire it tobe understood that in certain instances I may dispense with the same and make use of a coal or wood stove or coiled steam-pipe, or anything to generate heat that can be imparted conducted by the flues from the furnace to different rooms.

- It will be obser'vedthat the sole object of the outlets? is to convey the heat to the apartment or apartments, and that the sole object of the pipe 25 is to convey the productsof combustion from the drum 8 to a chimney. It will also be seen that the tubes 9 are bent laterally at their lower ends and open through the side of the case, and that the heat-generator 9 is arranged below said drum and bent ends of the tubes. arrangement thetubes are more exposed to the heat-generator, and-I am enabled to fill the drum with tubes, and thus avoid the estoo By this construction and cape of considerable heat through the pipe 25.;

Having thus describediny invention, what I claim is An air heater consisting of the casing 1,

5 having an outlet, 7, a horizontal perforated bottom wall, 5, a horizontal air-inlet flue, 3,

- beneath said bottom wall to supply air therethrough to the casing, a drum, 8, within the casing, a series of air-heating tubes in the to drum opening at their upper ends through the top portion of the drum, and having their lower ends bent laterally and opening through the side of the drum,-ia heat-generator above the perforated bottom wall and belowthedrum and the laterally-bent ends of the tubes, and a 15 

